莠去津分子印迹聚合物的合成及其吸附性能  

Synthesis and Adsorbability of Atrazine Molecularly Imprinted Polymer

作　　者：霍佳平[1,2] 司士辉[1] 王颜红[2] 张红[2] 王世成[2] 林桂凤[2] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]中国科学院沈阳应用生态研究所,辽宁沈阳110015

出　　处：《合成化学》2010年第2期159-163,共5页Chinese Journal of Synthetic Chemistry

基　　金：中国科学院知识创新工程项目(KSCX2-YW-N-035);财政部专项绿色农业科学研究与示范项目(2007-10);沈阳市大型仪器协作项目(2007GX-50)

摘　　要：以莠去津(1)为模板分子,甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯(EDMA)为交联剂,在偶氮二异丁腈(AIBN)的引发下,于65℃聚合17 h合成了对1有特异识别性能的分子印迹聚合物(2)。用紫外分光光度法探索了1与MAA的最佳比例,研究了2的吸附性能力,并利用高效液相色谱法对2的选择性进行了考察。用Scatchard法分析表明,2通过氢键作用力结合,存在两种结合位点,对1的吸附存在两种形态,最大表观吸附量(Qmax,1)为130.9 nmol.g-1,平衡离解常数(Kd,1)为30.8 nmol.L-1,Qmax,2为540.5 nmol.g-1,Kd,2为450.5 nmol.L-1。与西玛津相比,2对1显示出一定的选择性。以2作为填料制备出具有莠去津分子印迹的固相萃取柱,可对水质中2×10-8mol.L-1以下的待测物进行富集和分离,回收率近90%。Using atrazine （1） as template, α-methacrylic aid （MAA） as monomer, ethylene glycol dimethacrylate （EDMA） as cross-linker and 2,2-azobisisobutyronitrile （AIBN） as initiator, the molecular imprinted polymer（2）, which could specially recognize 1, was synthesized by polymerization at 65 ℃ for 17 h. The best proportion of 1 and MAA and the adsorbability of 2 were investigated by UV. The absorption selectivity of 2 was investigated by HPLC. Through the analysis of Scatchard plot, the results showed that the 2 could form two kinds of binding sites by hydrogen bond. The adsorption of 1 had two forms, so the apparent maximum number （ Qmax ） and the equilibrium dissociation eonstant（Kd） of MIPs were found to be Qmax,1 = 130.9 nmol · g^-1, Kd,1 =30.8 nmol · L^-1, Qmax=,2 = 540.5 nmol · g^-1, K d,2 = 450.5 nmol · L^- 1. 2 showed higher affinity and selectivity for 1 than for ametryn. The solid phase extraction pillar being stuffed with the polymers could enrich atrazine of less than 2 × 10 ^-8 mol· L^-1 in the water with the recovery of nearly 90%.

关 键 词：分子印迹聚合物 莠去津 模板分子 吸附性能 合成 

分 类 号：O63[理学—高分子化学]